A conservation scientist dissolves a sample of an unknown mineral in water. Dilute hydrochloric acid is added to a portion of the solution, followed by barium chloride solution. A white precipitate forms.
State the negative ion present in the sample.
Write the ionic equation, including state symbols, for the reaction that forms the precipitate.
107 exam-style questions on OCR GCSE Chemistry 4.2 Identifying the products of chemical reactions, covering 4.2.1 Tests to identify gases, 4.2.2 Tests for aqueous ions and flame tests, and 4.2.3 Instrumental methods of analysis. Each one has a worked solution and a mark scheme showing where the marks go.